Convicts are not peaceful but i have heard of severums with convicts just make sure there all female or all male. i would say go all female cuz convict females have color and less aggression
also not so many convicts i think cuz female convicts if there are no mails around they sometimes team up with other females lay eggs and act as a pair but the eggs wont hatch but they still get real aggressive
If they are male and female they could breed. You do not want this to happen Hybrids are a no no
-Mike